Why are the Miller-Urey experiments essential to the theory of evolution? They showed that life can only come from life.
They showed that electricity can create life.
They showed how organic molecules could be made from Earth's early atmosphere.
They showed the role that natural selection played in the evolution of modern day organisms.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

a community that experiences major changes undergoes progress

protistas excret ethanol used in the manufacture of vinegar